18211910611 has 4 divisors (see below), whose sum is σ = 18224568000. Its totient is φ = 18199253224.

The previous prime is 18211910557. The next prime is 18211910621. The reversal of 18211910611 is 11601911281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11601911281 = 191 ⋅60742991.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18211910611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18211910621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6326536 + ... + 6329413.

It is an arithmetic number, because the mean of its divisors is an integer number (4556142000).

Almost surely, 2^18211910611 is an apocalyptic number.

18211910611 is a deficient number, since it is larger than the sum of its proper divisors (12657389).

18211910611 is a wasteful number, since it uses less digits than its factorization.

18211910611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12657388.

The product of its (nonzero) digits is 864, while the sum is 31.

The spelling of 18211910611 in words is "eighteen billion, two hundred eleven million, nine hundred ten thousand, six hundred eleven".